Numerical study and pilot evaluation of experimental data measured on specimen loaded by bending and wedge splitting forces by S. Seitl, R. Diego Liedo

Get full text

Study on dynamics characteristic on combination misalignment and rubbing of the dual-rotor system by YAO Xia, NAN Guofang, LI Yao, QIU Xuewen

“…The misalignment of the dual-rotor system for the aero-engine will lead to abnormal increase of the vibration which results in the rotor-stator rubbing and affects the safty and stability of the rotor operation.The dual-rotor system was taken as the research object.Considering the combination misalignment-rubbing fault, the dynamic model of the rotor system is established based on the lumped mass method.The differential equation of the system motion was established according to the Lagrange equation, and the Range-Kutta method was used to solve it.The influence mechanism of the key parameters such as the speed, the misalignment angle and the coupling misalignment on the nonlinear dynamic characteristics of the system was studied.The results show that the system presents complex dynamic characteristics such as periodic, multi-periodic, quasi-periodic and chaotic motion with the increase of the rotor’s speed.When the speed is in the range of 1 500-2 200 rad/s, the system switches between periodic 2 motion and chaotic state through multiple paroxysmal bifurcations and paroxysmal inverted bifurcations.There are nonlinear phenomena such as jump in the bifurcation diagram of the vibration response with the change of the parallel misalignment of the coupling.As the misalignment angle of the bearing increases, the chaotic interval of the high speed decreases, and the stable periodic motion interval increases.…”
Get full text

INTEGRAREA SARCINILOR PROFESIONALE ÎN PROIECTE ŞCOLARE: DEZVOLTAREA COMPETENȚELOR CHEIE by USM ADMIN

“…În plus, integrarea feedback-ului din industrie oferă educatorilor un cadru pentru a evalua competențele elevilor în raport cu standardele profesionale, sporind astfel rigurozitatea evaluării competențelor. …”
Get full text

Sensorless Direct Torque Control of the Six-Phase Induction Motor by Fast Reduced Order Extended Kalman Filter by Asghar Taheri, Hai-Peng Ren, Chun-Huan Song

“…The EKF model can estimate speed, flux, load torque, and stator resistance in low speed; thus, optimization can be performed in all loads and speed range. …”
Get full text

Stability Analysis of a Wind Turbine Controlled by Direct Torque Control by Djamel Ikni, Elena Raducan

“…Robustness tests were simulated to highlight the sensitivity of this control to variations in the stator resistance of asynchronous machines. To make this command robust and stable, a fuzzy estimator was used with this command. …”
Get full text

A szürke OSINT gyanús? by István Solti

“…Megállapítások: A szerző arra a következtetésre jut, hogy az OSINT egyes információszerző eljárásai törvényi felhatalmazás nélkül átléphetik azt a határt, amikor a magatartások már a bűntetőjog számára is értékelhetővé válnak. …”
Get full text

Stare i nowe we wspólnej polityce rolnej 2014-2020 – próba oceny z punktu widzenia interesów polskiego rolnictwa by Andrzej Czyżewski, Sebastian Stępień

“…Zakończona w czerwcu prezydencja duńska podsumowała przebieg dotychczasowych konsultacji. Efektem prac jest raport w sprawie WPR w nowym okresie programowania, który odnosi się do zaprezentowanych przez Komisję Europejską zmian i który przedstawia obszary zbieżności i rozbieżności między krajami UE w zakresie poszczególnych rozwiązań. …”
Get full text

Analysis of the Impact of Magnetic Materials on Cogging Torque in Brushless DC Motor by K. Karthick, S. Ravivarman, Ravi Samikannu, K. Vinoth, Bashyam Sasikumar

“…The effect of neodymium magnets (NdFeB), compression molded magnet, and samarium cobalt (SmCo) magnet on the cogging torque is analyzed to the BLDC motor designed for hybrid electric vehicle traction that has the peak power rating of 50 kW motor with 48 stator slots and 8 rotor poles. With the presence of these three magnetic materials, the cogging torque is estimated independently using multiposition simulation. …”
Get full text

Prispevek k poznavanju flore okolice Ormoža (vzhodna Slovenija) by Nejc Jogan, Tinka Bačič, Branko Vreš

“… Na Raziskovalnem taboru študentov biologije (RTŠB) Središče ob Dravi '97 je floristična skupina kartirala floro v 5 kvadrantih MTB (240-450 vrst v vsakem). …”
Get full text

AGENȚIA ACHIZIȚII PUBLICE ȘI ROLUL ACESTEIA ÎN CADRUL PROCEDURILOR DE ACHIZIȚIE PUBLICĂ ÎN REPUBLICA MOLDOVA by USM ADMIN

“…Cuvinte-cheie: achiziții, Agenția achiziții publice, procedură, rol, anunț de atribuire, principii, lege, raport. DOI: https://doi.org/10.59295/sum8(178)2024_06 …”
Get full text

CONDIȚIILE NECESARE PENTRU CONSTITUIREA UNEI FIDUCII EXPRESE by USM ADMIN

“…Se constată că există o conexiune între reglementările analizate, care poate fi întrezărită și în raport cu cerințele existente potrivit dispozițiilor legale naționale. …”
Get full text

Impact-Rubbing Dynamics of Rotor with Hollow Shaft and Offset Discs Based on MDOF Timoshenko Beam Theory by Guofang Nan, Xia Yao, Jingya Yao, Chao Wang

“…The research results indicate that the power turbine rotor with the hollow shaft on operation shows the various nonlinear dynamic behaviors including the multiperiod, quasi-period, jumping phenomenon, and chaotic motions; there exists an optimal gap between the rotor and the stator from the perspective of the efficiency and the dynamics; the optimal gap should make system avoid the resulting chaos or the quasi-period motion for the stability and safety of the machinery.…”
Get full text

A New Open Loop Approach for Identifying the Initial Rotor Position of a Permanent Magnet Synchronous Motor by Qixin Zhu, Lei Xiong, Hongli Liu, Yonghong Zhu, Guoping Zhang

“…By giving a testing current with high frequency to the stator winding, the initial rotor position of a PMSM can be detected with reasonable accuracy. …”
Get full text

Analysis of Slotted Tooth Switched Reluctance Motors for Electric Vehicle Applications by Mohamed A. Abdel Tawab, Hamdy Shatla, M. Bahy

“…The overall performance of the RST-SRM was carried out in addition to comparing it with performance of both stator-slotted tooth SRM (SST-SRM) and conventional SRM. …”
Get full text

Asking and answering: A contrastive study of English and Swedish basic communication verbs by Åke Viberg

“…English has a number of verbs such as answer, reply, respond, correspond, retort and rejoin, whereas Swedish to a great extent relies on one verb (svara) and its morphological derivations: besvara, ansvara, motsvara, försvara. …”
Get full text

Federico de Madrazo y los figurines de Giovanna la Pazza para la actriz Adelaide Ristori by Juan Ramón Sánchez del Peral y López

“…Dicho material permite atribuir al pintor español los dibujos de los figurines para esta pieza de teatro custodiados en el Fondo Adelaide Ristori del Civico Museo Biblioteca dell’Attore de Génova y, a su vez, relacionar con dichos figurines dos dibujos y una fotografía del Museo Nacional del Prado.…”
Get full text

Numerical Analysis of Flow Field in Generator End-Winding Region by Wei Tong

“…Based on the analysis, the cooling flow rate at each flow branch (rotor-stator gap, rotor subslot, outside space block, and small ventilation holes to the heat exchanger) was determined, and the high-pressure gradient zones were identified. …”
Get full text

Dynamic Response in Transient Operation of a Variable Geometry Turbine Stage: Influence of the Aerodynamic Performance by Nicolas Binder, Jaime Garcia Benitez, Xavier Carbonneau

“…This has been reproduced on different declinations of the same stage, through the variation of the stator geometry, and correlated to the steady-state performance of the initial and final operating points of the transient phase. …”
Get full text

Joint estimation of frequency and DOA with spatio-temporal under sampling by Xiang-dong HUANG, Hong-yu XIAN, Zi-yang YAN, Sen-xue JING

“…In order to estimate the frequency and DOA of an incident signal with sub-Nyquist spatio-temporal sampling,A novel joint estimation algorithm based on spectrum correction and Chinese remainder theorem(CRT)was proposed.Firstly,the incident signal was parallelly sampled at multiple sensors non-uniformly located in a sparse linear array.Then,AM spectrum corrector was employed to extract the rema of frequency and phase-difference from a small quantity of snapshots.Finally,implementing the close-form CRT on these remainders directly yields the estimates of frequency and DOA.In the proposed scheme,the spectrum corrector was shared by both the frequency estimator and the DOA es-timator,which contributed to a high utilization of the snapshots.Furthermore,compared to the existing CRT based esti-mators,the proposed estimator needs not to incorporate multiple times of temporal undersampling on a single sensor,which saves considerable time consumption and thus obtain high ability of tracking time-variant objects.Simulations verify the feasibility and the high-accuracy of the proposed joint estimator and further study shows that high reconstruc-tion probability can be realized even in low SNR cases,which present the vast potential for future development.…”
Get full text

Ortega on liberalism and democracy: revisiting an old discussion by Carlos Morujão

“…I also try to highlight the changes in Ortega’s concept of liberalism, from his early liberal socialism (under the influence of Paul Natorp) to the mature liberalism that follows Ortega’s acceptance of phenomenology, of which we find a document in Meditations on Quixote of 1914 and in “New and old politics”, published in the same year. …”
Get full text